add signal and raise bindings for windows
This PR adds `signal` and `raise` bindings for windows.
I don't know these functions or linux very well, so I leaned on other overrides of signal in the linux bindings, and the [cppreference page](https://en.cppreference.com/w/cpp/header/csignal) for adding the bindings.
I added some constants that were shown on the [microsoft signal page](https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/signal?view=vs-2017) and used the default values I found spelunking through my own copy of `signal.h` that came along with visual studio.
The automated tests pass and my toy apps use the `signal` and `raise` as expected. Let me know if there is anything else I need to do, or any extra tests to write.
EDIT:
currently working on getting a nice isolated msys2 environment I can use to dev against.
- [x] msys2 env setup and building
Added setegid function
Adding the `setegid` function to libc. I had a look and this is in Apple, Linux and Fuchsia so I'm hoping it works for all the BSDs etc. But if anything fails in CI I'll change it accordingly.
Bump ctest from 0.2.7 to 0.2.8
Bumps [ctest](https://github.com/alexcrichton/ctest) from 0.2.7 to 0.2.8.
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